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CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Available-for-sale Securities, Amortized Cost Basis $ 3,104,152 $ 2,792,326
Debt Securities, Held-to-maturity, Fair Value $ 153,039 $ 424,118
Common Stock, No Par Value $ 0 $ 0
Common Stock, Shares Authorized 160,000,000 160,000,000
Common Stock, Shares, Issued 104,281,794 104,281,794
Treasury Stock, Shares 5,634,104 6,387,508